package com.dance.netty.netty.simple;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

public class NettyClient {

    public static void main(String[] args) throws InterruptedException {

        // 客户端需要一个事件循环组
        EventLoopGroup eventExecutors = new NioEventLoopGroup();

        try {
            // 创建客户端启动对象
            // 注意客户端使用的不是 ServerBootstrap 而是 Bootstrap
            Bootstrap bootstrap = new Bootstrap();

            bootstrap.group(eventExecutors)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new NettyClientHandler());
                        }
                    });
            System.out.println("客户端 ok !");
            // 启动客户端去连接服务端
            // 关于 ChannelFuture 要分析, 涉及到Netty的异步模型
            ChannelFuture sync = bootstrap.connect("127.0.0.1", 6668).sync();
            // 给关闭通道进行监听
            sync.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            eventExecutors.shutdownGracefully();
        }
    }

}
